ADVANCED FUNCTIONAL MATERIALS
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2025
·
IF 19
Jian Zhang,Jia-Fang Xie,Jie-Jie Chen,Wen-Wei Li,Jia-Cheng E. Yang,Yu-Ming Zheng,Han-Qing Yu
Heterogeneous peroxymonosulfate (PMS) activation is of great potential for sustainably degrading antibiotics included emerging contaminants from water. However, developing synthetic metal catalysts with incompatible mass transfer and optimized metal sites to effectively enable low-levels PMS activation and antibiotics removal is challenging. Herein, a protein-like Co catalyst of spatially hierarchical hydrophilicity is synthesized by constructing flower-like Mg/Al layered double hydroxide (LDH) on super-active carbon (AC) to disperse thin-layer Co(OH) 2 along the edge of LDH. The resulting AC-LDH@Co(OH) 2 catalyst demonstrates an impressive antibiotic removal of ≈80% within 15 s and turnover frequency of 45.72 min −1 based on catalyst mass by activating 0.075 mM PMS, surpassing single-atom catalysts included reports. In a fixed-bed reactor with secondary wastewater effluent, AC-LDH@Co(OH) 2 realizes complete removal of norfloxacin for 66 h with neutral effluent pH and negligible metal leaching. Experiments combined with theoretical computations reveal that the protein-like complex not only accelerates transfer of low-levels hydrophilic PMS and hydrophobic antibiotics, but also stably confines Co sites with regulated electronic structure for multiply reactive oxygen species generation.
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Ying Wu,Min Li,Wenhui Fang,Yutao Cao,Shixian Xin,Hong Zhao
Electrochemical water splitting is a promising method for hydrogen production but is restricted by sluggish oxygen evolution reaction (OER), so we propose to replace OER with the thermodynamically preferred glucose oxidation reaction (GOR) to reduce the supply voltage. Herein, hollow RuV-Co(OH) 2 arrays have been fabricated by the hydrothermal method of sacrificing ZIF-67 to codope vanadium (V) and ruthenium (Ru). Electrochemical studies show that RuV-Co(OH) 2 has excellent hydrogen evolution reaction (HER) activity with a low overpotential of 77 mV at the current density of 10 mA cm −2 (η 10 = 77 mV) and good GOR activity. Density functional theory (DFT) calculations indicate that V and Ru tune the electronic structure of RuV-Co(OH) 2 , greatly increasing the density of the active sites. Moreover, RuV-Co(OH) 2 assembled glucose-assisted hydrogen evolution cell exhibits a battery voltage of 1.42 V for a current density of 10 mA cm −2 , a significant reduction of 240 mV compared to overall water splitting along with higher-value glucose oxidation products. Furthermore, RuV-Co(OH) 2 exhibits outstanding stability. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) analysis demonstrate that RuV-Co(OH) 2 has superior mechanical stability. This work opens up a new approach to designing novel bifunctional electrocatalysts for energy-saving H 2 production and valuable coproductions.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 2
·1-12
·
IF 2.132
Sun Xueying,Li Siqi,Liu Rongmei,Sun Xiulun,Liu Xinjie,Li Anran,Li Wen
In this work, we designed a simple hydrothermal synthetic method for a ZnCo-PBA@α-Co(OH) 2 nanosphere@nanosheet material with good electrochemical properties. The obtained material had a specific capacitance of 423.92 F g −1 at 1 A g −1 and a cycling retention ratio of 78.48% after 1000 cycles at 5 A g −1 . A hybrid supercapacitor device (ZnCo-PBA@α-Co(OH) 2 //AC) assembled with activated carbon as the negative electrode had a specific capacitance of 122.4 F g −1 at 1 A g −1 , a cycling retention rate of 73.53% after 5000 cycles at 5 A g −1 , and a very high energy density of 49.13 Wh kg −1 at power density of 1734.0 W kg −1 . The significantly improved electrochemical performance of the ZnCo-PBA@α-Co(OH) 2 nanocomposites can be attributed to the positive synergistic effects of the porous structure of the PBA material and the large specific surface area of the α-Co(OH) 2 nanosheets, on the ion permeability and number of active sites in the reinforcing material; thus, this composite is a potential material for use in future energy storage systems.
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DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Chenjie Liu,Yijin Wang,Wenlong Xu,Ming Zhou,Fuliang Meng,Xianfeng Meng
In light of electromagnetic pollution caused by the excessive or unregulated use of electromagnetic waves (EMWs), there is an urgent requirement to identify economical EMWs absorption materials. However, the facing challenge lies in the precise design of microstructure and the controlled tuning of electromagnetic parameters. Herein, natural cottonwood fiber was converted into carbon fiber (CF) through optimized pyrolysis, followed by the synthesis of CFs@Co 3 O 4 /Co(OH) 2 composites via in situ hydrothermal method. Ingenious structural design, multi-faceted synergy and heterogeneous interfaces endowed the CFs@Co 3 O 4 /Co(OH) 2 composites with exceptional impedance matching and electromagnetic loss, showing outstanding EMWs absorption ability. The CFs@Co 3 O 4 /Co(OH) 2 sample (CF S @Co-25) with 2.5 mm thickness displayed a maximum reflection loss ( RL max ) of −78.7 dB and an effective absorption bandwidth ( EAB ) of 9.9 GHz. At 3.0 mm matching thickness, the impedance matching value ( Z ) reached 0.99, with an RL max of −105.3 dB. This work offers a scalable and economical approach to developing high-performance carbon-based EMWs absorbers.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Mengyin Liao,Chao Wang,Xuanhua Zhang,Chao Luan,Wenyuan Xu,Zhongyi He
Novel Pt/Co(OH)2-NiO/C catalysts based on carbon black were successfully synthesized using the hydrazine hydrate reduction method and galvanic replacement strategies. They were subsequently tested for their activity in the electrocatalytic oxidation of methanol. It was observed that the peak current density of Pt/Co(OH)2-NiO/C (8.29 A mg-1Pt) was 22.4 times higher than that of commercial Pt/C-JM (0.37 A mg-1Pt). The electrocatalytic activities and durabilities of the synchronously synthesized Pt/Co(OH)2-NiO/C catalysts were significantly better than those of PtCo/C, PtNi/C, and PtCoNi/C-X (X = 200, 400, 600) catalysts synthesized by calcination in Ar at different temperatures. The reason is that the highly dispersed Pt helps to expose more active sites on the catalyst surface, and the addition of Co(OH)2 and NiO alters the electron density of Pt, which reduces the adsorption of intermediate CO, attenuates the toxic effect, and enables more efficient oxidation of methanol.
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高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Xueyang Song,Li Huang,Wenxue He,Chengyong Liu,Fengchun Hu,Yong Jiang,Zhihu Sun,Shiqiang Wei
Electronic metal–support interactions (EMSIs) have opened a new way to tailor the electronic and catalytic properties of supported catalysts. Herein, we demonstrate the EMSIs between Pt nanoparticles and Co(OH)2 flakes grown on SiO2 and show its beneficial effect on enhancing the CO oxidation activity. The EMSI characteristics of the Pt–Co(OH)2/SiO2 catalyst are identified by in situ X-ray absorption fine structure (XAFS) spectroscopy, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and transmission electron microscopy. Quantitative XAFS analysis reveals the presence of metallic-like Pt–Co bonds. The formation of Pt–Co intermetallic bonds allows for electron donation form Co to Pt, leading to the negative charging of the Pt atoms as evidenced by reduced Pt 2p-to-5d electron-transition intensity detected by XAFS spectroscopy and the emergence of a CO adsorption band at 2063 cm–1 in DRIFTS. The significance of EMSIs is manifested by comparing the CO oxidation activity over the Pt–Co(OH)2/SiO2 and Pt/SiO2 catalysts with similar Pt loadings. Pt–Co(OH)2/SiO2 is superior to Pt/SiO2 in both the apparent activation energy (19 vs 64 kJ/mol) and the turnover frequency (0.03 vs 0.003 s–1 at 37 °C). The enhanced activity is attributed to the negative charging of Pt, which downshifts the d-band center and reduces the CO adsorption strength.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2026
·
IF 8.2
Fengling Jiang,Ziwei Lan,Yongzheng Ma,Yuan Zhang,Xiaoqing Li,Dickon H.L. Ng,Jia Li
Micro/nanomotors have demonstrated significant potential in environmental monitoring and water remediation owing to their enzyme-like catalytic properties and self-driven ability. Herein, we developed a conical Co(OH) 2 @MnO 2 micromotor through an integrated oil bath-hydrothermal synthesis strategy. The micromotors feature MnO 2 nanosheets arranged in a two-dimensional cross-array architecture on their microconical surfaces, which effectively catalyze H 2 O 2 decomposition to produce oxygen bubbles, enabling robust self-propulsion. The speed of the micromotor can reach 138.59 ± 2.03 μm/s in7 wt% H 2 O 2 solution. The combination of excellent enzyme-like activity and self-driven ability of micromotor constructs a dynamic sensitive detection platform for resveratrol (RES, 3,4′,5-trihydroxystilbene), a potential pollutant in water, with a low concentration detection limit of 0.23 μM. In addition, hydrogen peroxide and peroxymonosulfate (PMS) were used as catalytic substrates to catalyze the micromotor to generate various reactive oxygen species (ROS), thus achieving efficient synergistic degradation of resveratrol. Under neutral pH conditions, the degradation rate of resveratrol by the micromotors was 91.6% within 40 min. This study provides an intelligent strategy for developing dynamic sensors with the dual functions of detecting and degrading RES simultaneously.
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PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 51
·33056-33063
·
IF 4.036
Bo Huang,Zhihua Zhao,Pu Chen,Baocang Zhou,Zhuo Chen,Yu Fu,Hongyu Zhu,Chen Chen,Shuaiwen Zhang,Anbiao Wang,Pu Shi,Xiaoqing Shen
Ammonia (NH3) is a common air pollutant and is a biomarker for kidney disease. Therefore, the preparation of ammonia gas sensors with high sensitivity, good selectivity and low operating temperature is of great importance for health protection. Using the in situ electrostatic self-assembly approach, a chemoresistive gas sensor based on Co(OH)2/Ti3C2Tx hybrid material was created in this study. The prepared samples were characterized by XRD, XPS, TEM, BET and other testing methods for structure, surface topography and elements. These samples were fabricated into sensors, and the gas sensing properties of the materials were investigated under different test conditions. The results show that the gas response value of the C/M-2 sensor is up to about 14.7%/100 ppm, which is three times the response value of the sensor made of pure MXene to NH3. In addition, the Co(OH)2/Ti3C2Tx hybrid sensors exhibit excellent repeatability, high sensitivity under low concentration (less than 5 ppm), fast response/recovery time (29 s/49 s) and long-time stability, which indicates their promising utility in the IoT field.
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PubMed
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 26
·4764-4771
·
IF 3.756
Tingting Fan,Yan Ke,Lijun Zhang,Li Cai,Zhongbo Li
Large-area three-dimensional (3D) well-ordered Co(OH)2 nanoflower array films decorated with Ag nanoparticles (Ag NPs) with a novel structure were designed as sensitive SERS substrates for trace detection of pesticides. Co(OH)2 nanoflowers were electrodeposited on the surface of molded polyacrylonitrile (PAN) films with ordered nanopillar arrays and then Ag NPs were sputtered onto of the surface of each Co(OH)2 nanoflower. The SERS performance of the as-prepared films can be optimized by tuning the Ag-sputtering duration and the morphology of the Co(OH)2 nanoflower arrays. Owing to the formation of high-density SERS “hotspots” created in the nanogaps between the adjacent Ag NPs located on the same and neighbouring Co(OH)2 nanosheets, the optimized substrates show SERS activity for probe molecules. As a result, 10−11 M rhodamine 6G and 10−9 M 4-aminothiophenol can be SERS recognized, respectively. To verify their practical application, the optimized SERS substrates were employed for trace detection of thiram (a type of pesticide), and 10−9 M thiram can be recognized, showing great potential in pesticide detection.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 40
·18818-18824
·
IF 3.3
Yaoxia Yang,Xingwei Guo,Mi Kang,Dangxia Wang,Zhiwang Yang
Developing efficient and inexpensive catalysts for the hydrogen evolution reaction (HER) is critical for the commercial viability of electrochemical sustainable energy technologies. In this study, a La-CoP/Co(OH)2 nanoarray supported on nickel foam (NF) was successfully prepared using the secondary hydrothermal and low-temperature phosphating method. The as-prepared La-CoP/Co(OH)2/NF material exhibited excellent hydrogen evolution performance in 1 M KOH solution. The overpotential of La-CoP/Co(OH)2/NF was 114 mV at the current density of 10 mA cm−2, and the Tafel slope was estimated to be 99 mV dec−1. The decoration of Co(OH)2 nanosheets on La-CoP nanorods with the textured surface not only provides a large surface area and more active sites but also promotes the transfer of electrons between Co(OH)2 and La-CoP, which accelerates the reaction rate and further improve the HER performance of the composite material. Additionally, the fabricated catalyst exhibits good stability and durability in alkaline media. This approach provides a feasible and effective strategy for exploring electrocatalysts with high efficiency and low prices for the electrolysis of water.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yanling Li,Jinfu Ma,Shaolin Yang,Lihua Cui,Hui Lu
Material defects play an important role in metal oxide-based or hydroxide-based supercapacitors . Oxygen vacancies as anion vacancy defects can not only offer a high electron conductivity by act as shallow donors but also can adjust the materials’ surface properties. Herein, we synthesis a novel oxygen-vacancy-rich Co(OH) 2 /SnOᵪ/C hybrid nanosheets which are prepared by using a facile one-step hydrothermal route. Possessing special petal-like nanosheets and rich oxygen vacancies, the as-prepared dual ligand hybrid nanosheets (marked Co(OH) 2 /SnOᵪ/C) present a high specific capacitance of 806.36 F g −1 at 1 A g −1 , much higher than single ligand compound (338.36 F g −1 or 450.00 F g −1 ). The solid-state asymmetrical supercapacitors assembled with Co(OH) 2 /SnOᵪ/C show energy density of 49.73 Wh kg −1 with a power density of 1599.98 W kg −1 , and good cycle stability with 64.43% capacitance retention after 20,000 cycles at the current density of 1 A g −1 .
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Catalysis Science & Technology
·
2021
·Vol. 11
·期 11
·3706-3714
·
IF 6.119
Lekai Zheng,Lina Hu,Yongchuan Hu,Fang Liu,Zhiming Liu,Yanming Xue,Jun Zhang,Hui Liu,Chengchun Tang
The development of efficient, stable and low-cost oxygen evolution reaction (OER) catalysts in anodes is essential for the production of hydrogen resources by electrolyzing water. Cobalt hydroxide (α-Co(OH)2) is one of the most encouraging electrocatalysts for the OER under alkaline conditions, but its catalytic activity is still unsatisfactory possibly due to its unfavorable electronic structure. The construction of heterogeneous catalysts has been considered as an effective strategy to change the interface and modulate the electronic structure of electrocatalysts, resulting in improved activities. Herein, novel self-supported α-Co(OH)2 coated Co3O4 nanosheet arrays on conductive carbon cloth have been constructed and fabricated via a simple electrodeposition method (α-Co(OH)2/Co3O4/CC), serving as efficient catalysts for the OER. The as-prepared heterostructure with optimal proportions of α-Co(OH)2 to Co3O4 exhibits an enhanced overpotential of 275 mV at 10 mA cm−2 (322 mV for α-Co(OH)2/CC and 359 mV for Co3O4/CC), a low Tafel slope of 76 mV dec−1 and excellent durability for 22 h. The further electrochemical results show that the formation of heterostructure can optimize the electronic structure of the catalysts through interfacial coupling effect, improve the charge transfer ability and increase the electrochemical active sites, all of which are beneficial to the OER performance enhancement. This work not only develops a highly efficient and stable non-precious metal catalyst toward the OER, but also opens up new ways for boosting the performance by regulating the electronic structure through interface engineering of electrocatalysts and beyond.
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